fs/ext4/ext4_common.c

   1 /*
   2  * (C) Copyright 2011 - 2012 Samsung Electronics
   3  * EXT4 filesystem implementation in Uboot by
   4  * Uma Shankar <uma.shankar@samsung.com>
   5  * Manjunatha C Achar <a.manjunatha@samsung.com>
   6  *
   7  * ext4ls and ext4load : Based on ext2 ls load support in Uboot.
   8  *
   9  * (C) Copyright 2004
  10  * esd gmbh <www.esd-electronics.com>
  11  * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
  12  *
  13  * based on code from grub2 fs/ext2.c and fs/fshelp.c by
  14  * GRUB  --  GRand Unified Bootloader
  15  * Copyright (C) 2003, 2004  Free Software Foundation, Inc.
  16  *
  17  * ext4write : Based on generic ext4 protocol.
  18  *
  19  * SPDX-License-Identifier:     GPL-2.0+
  20  */
  21
  22 #include <common.h>
  23 #include <ext_common.h>
  24 #include <ext4fs.h>
  25 #include <inttypes.h>
  26 #include <malloc.h>
  27 #include <memalign.h>
  28 #include <stddef.h>
  29 #include <linux/stat.h>
  30 #include <linux/time.h>
  31 #include <asm/byteorder.h>
  32 #include "ext4_common.h"
  33
  34 struct ext2_data *ext4fs_root;
  35 struct ext2fs_node *ext4fs_file;
  36 __le32 *ext4fs_indir1_block;
  37 int ext4fs_indir1_size;
  38 int ext4fs_indir1_blkno = -1;
  39 __le32 *ext4fs_indir2_block;
  40 int ext4fs_indir2_size;
  41 int ext4fs_indir2_blkno = -1;
  42
  43 __le32 *ext4fs_indir3_block;
  44 int ext4fs_indir3_size;
  45 int ext4fs_indir3_blkno = -1;
  46 struct ext2_inode *g_parent_inode;
  47 static int symlinknest;
  48
  49 #if defined(CONFIG_EXT4_WRITE)
  50 struct ext2_block_group *ext4fs_get_group_descriptor
  51         (const struct ext_filesystem *fs, uint32_t bg_idx)
  52 {
  53         return (struct ext2_block_group *)(fs->gdtable + (bg_idx * fs->gdsize));
  54 }
  55
  56 static inline void ext4fs_sb_free_inodes_dec(struct ext2_sblock *sb)
  57 {
  58         sb->free_inodes = cpu_to_le32(le32_to_cpu(sb->free_inodes) - 1);
  59 }
  60
  61 static inline void ext4fs_sb_free_blocks_dec(struct ext2_sblock *sb)
  62 {
  63         uint64_t free_blocks = le32_to_cpu(sb->free_blocks);
  64         free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32;
  65         free_blocks--;
  66
  67         sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff);
  68         sb->free_blocks_high = cpu_to_le16(free_blocks >> 32);
  69 }
  70
  71 static inline void ext4fs_bg_free_inodes_dec
  72         (struct ext2_block_group *bg, const struct ext_filesystem *fs)
  73 {
  74         uint32_t free_inodes = le16_to_cpu(bg->free_inodes);
  75         if (fs->gdsize == 64)
  76                 free_inodes += le16_to_cpu(bg->free_inodes_high) << 16;
  77         free_inodes--;
  78
  79         bg->free_inodes = cpu_to_le16(free_inodes & 0xffff);
  80         if (fs->gdsize == 64)
  81                 bg->free_inodes_high = cpu_to_le16(free_inodes >> 16);
  82 }
  83
  84 static inline void ext4fs_bg_free_blocks_dec
  85         (struct ext2_block_group *bg, const struct ext_filesystem *fs)
  86 {
  87         uint32_t free_blocks = le16_to_cpu(bg->free_blocks);
  88         if (fs->gdsize == 64)
  89                 free_blocks += le16_to_cpu(bg->free_blocks_high) << 16;
  90         free_blocks--;
  91
  92         bg->free_blocks = cpu_to_le16(free_blocks & 0xffff);
  93         if (fs->gdsize == 64)
  94                 bg->free_blocks_high = cpu_to_le16(free_blocks >> 16);
  95 }
  96
  97 static inline void ext4fs_bg_itable_unused_dec
  98         (struct ext2_block_group *bg, const struct ext_filesystem *fs)
  99 {
 100         uint32_t free_inodes = le16_to_cpu(bg->bg_itable_unused);
 101         if (fs->gdsize == 64)
 102                 free_inodes += le16_to_cpu(bg->bg_itable_unused_high) << 16;
 103         free_inodes--;
 104
 105         bg->bg_itable_unused = cpu_to_le16(free_inodes & 0xffff);
 106         if (fs->gdsize == 64)
 107                 bg->bg_itable_unused_high = cpu_to_le16(free_inodes >> 16);
 108 }
 109
 110 uint64_t ext4fs_sb_get_free_blocks(const struct ext2_sblock *sb)
 111 {
 112         uint64_t free_blocks = le32_to_cpu(sb->free_blocks);
 113         free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32;
 114         return free_blocks;
 115 }
 116
 117 void ext4fs_sb_set_free_blocks(struct ext2_sblock *sb, uint64_t free_blocks)
 118 {
 119         sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff);
 120         sb->free_blocks_high = cpu_to_le16(free_blocks >> 32);
 121 }
 122
 123 uint32_t ext4fs_bg_get_free_blocks(const struct ext2_block_group *bg,
 124                                    const struct ext_filesystem *fs)
 125 {
 126         uint32_t free_blocks = le16_to_cpu(bg->free_blocks);
 127         if (fs->gdsize == 64)
 128                 free_blocks += le16_to_cpu(bg->free_blocks_high) << 16;
 129         return free_blocks;
 130 }
 131
 132 static inline
 133 uint32_t ext4fs_bg_get_free_inodes(const struct ext2_block_group *bg,
 134                                    const struct ext_filesystem *fs)
 135 {
 136         uint32_t free_inodes = le16_to_cpu(bg->free_inodes);
 137         if (fs->gdsize == 64)
 138                 free_inodes += le16_to_cpu(bg->free_inodes_high) << 16;
 139         return free_inodes;
 140 }
 141
 142 static inline uint16_t ext4fs_bg_get_flags(const struct ext2_block_group *bg)
 143 {
 144         return le16_to_cpu(bg->bg_flags);
 145 }
 146
 147 static inline void ext4fs_bg_set_flags(struct ext2_block_group *bg,
 148                                        uint16_t flags)
 149 {
 150         bg->bg_flags = cpu_to_le16(flags);
 151 }
 152
 153 /* Block number of the block bitmap */
 154 uint64_t ext4fs_bg_get_block_id(const struct ext2_block_group *bg,
 155                                 const struct ext_filesystem *fs)
 156 {
 157         uint64_t block_nr = le32_to_cpu(bg->block_id);
 158         if (fs->gdsize == 64)
 159                 block_nr += (uint64_t)le32_to_cpu(bg->block_id_high) << 32;
 160         return block_nr;
 161 }
 162
 163 /* Block number of the inode bitmap */
 164 uint64_t ext4fs_bg_get_inode_id(const struct ext2_block_group *bg,
 165                                 const struct ext_filesystem *fs)
 166 {
 167         uint64_t block_nr = le32_to_cpu(bg->inode_id);
 168         if (fs->gdsize == 64)
 169                 block_nr += (uint64_t)le32_to_cpu(bg->inode_id_high) << 32;
 170         return block_nr;
 171 }
 172 #endif
 173
 174 /* Block number of the inode table */
 175 uint64_t ext4fs_bg_get_inode_table_id(const struct ext2_block_group *bg,
 176                                       const struct ext_filesystem *fs)
 177 {
 178         uint64_t block_nr = le32_to_cpu(bg->inode_table_id);
 179         if (fs->gdsize == 64)
 180                 block_nr +=
 181                         (uint64_t)le32_to_cpu(bg->inode_table_id_high) << 32;
 182         return block_nr;
 183 }
 184
 185 #if defined(CONFIG_EXT4_WRITE)
 186 uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n)
 187 {
 188         uint32_t res = size / n;
 189         if (res * n != size)
 190                 res++;
 191
 192         return res;
 193 }
 194
 195 void put_ext4(uint64_t off, void *buf, uint32_t size)
 196 {
 197         uint64_t startblock;
 198         uint64_t remainder;
 199         unsigned char *temp_ptr = NULL;
 200         struct ext_filesystem *fs = get_fs();
 201         int log2blksz = fs->dev_desc->log2blksz;
 202         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz);
 203
 204         startblock = off >> log2blksz;
 205         startblock += part_offset;
 206         remainder = off & (uint64_t)(fs->dev_desc->blksz - 1);
 207
 208         if (fs->dev_desc == NULL)
 209                 return;
 210
 211         if ((startblock + (size >> log2blksz)) >
 212             (part_offset + fs->total_sect)) {
 213                 printf("part_offset is " LBAFU "\n", part_offset);
 214                 printf("total_sector is %" PRIu64 "\n", fs->total_sect);
 215                 printf("error: overflow occurs\n");
 216                 return;
 217         }
 218
 219         if (remainder) {
 220                 blk_dread(fs->dev_desc, startblock, 1, sec_buf);
 221                 temp_ptr = sec_buf;
 222                 memcpy((temp_ptr + remainder), (unsigned char *)buf, size);
 223                 blk_dwrite(fs->dev_desc, startblock, 1, sec_buf);
 224         } else {
 225                 if (size >> log2blksz != 0) {
 226                         blk_dwrite(fs->dev_desc, startblock, size >> log2blksz,
 227                                    (unsigned long *)buf);
 228                 } else {
 229                         blk_dread(fs->dev_desc, startblock, 1, sec_buf);
 230                         temp_ptr = sec_buf;
 231                         memcpy(temp_ptr, buf, size);
 232                         blk_dwrite(fs->dev_desc, startblock, 1,
 233                                    (unsigned long *)sec_buf);
 234                 }
 235         }
 236 }
 237
 238 static int _get_new_inode_no(unsigned char *buffer)
 239 {
 240         struct ext_filesystem *fs = get_fs();
 241         unsigned char input;
 242         int operand, status;
 243         int count = 1;
 244         int j = 0;
 245
 246         /* get the blocksize of the filesystem */
 247         unsigned char *ptr = buffer;
 248         while (*ptr == 255) {
 249                 ptr++;
 250                 count += 8;
 251                 if (count > le32_to_cpu(ext4fs_root->sblock.inodes_per_group))
 252                         return -1;
 253         }
 254
 255         for (j = 0; j < fs->blksz; j++) {
 256                 input = *ptr;
 257                 int i = 0;
 258                 while (i <= 7) {
 259                         operand = 1 << i;
 260                         status = input & operand;
 261                         if (status) {
 262                                 i++;
 263                                 count++;
 264                         } else {
 265                                 *ptr |= operand;
 266                                 return count;
 267                         }
 268                 }
 269                 ptr = ptr + 1;
 270         }
 271
 272         return -1;
 273 }
 274
 275 static int _get_new_blk_no(unsigned char *buffer)
 276 {
 277         int operand;
 278         int count = 0;
 279         int i;
 280         unsigned char *ptr = buffer;
 281         struct ext_filesystem *fs = get_fs();
 282
 283         while (*ptr == 255) {
 284                 ptr++;
 285                 count += 8;
 286                 if (count == (fs->blksz * 8))
 287                         return -1;
 288         }
 289
 290         if (fs->blksz == 1024)
 291                 count += 1;
 292
 293         for (i = 0; i <= 7; i++) {
 294                 operand = 1 << i;
 295                 if (*ptr & operand) {
 296                         count++;
 297                 } else {
 298                         *ptr |= operand;
 299                         return count;
 300                 }
 301         }
 302
 303         return -1;
 304 }
 305
 306 int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index)
 307 {
 308         int i, remainder, status;
 309         unsigned char *ptr = buffer;
 310         unsigned char operand;
 311         i = blockno / 8;
 312         remainder = blockno % 8;
 313         int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
 314
 315         i = i - (index * blocksize);
 316         if (blocksize != 1024) {
 317                 ptr = ptr + i;
 318                 operand = 1 << remainder;
 319                 status = *ptr & operand;
 320                 if (status)
 321                         return -1;
 322
 323                 *ptr = *ptr | operand;
 324                 return 0;
 325         } else {
 326                 if (remainder == 0) {
 327                         ptr = ptr + i - 1;
 328                         operand = (1 << 7);
 329                 } else {
 330                         ptr = ptr + i;
 331                         operand = (1 << (remainder - 1));
 332                 }
 333                 status = *ptr & operand;
 334                 if (status)
 335                         return -1;
 336
 337                 *ptr = *ptr | operand;
 338                 return 0;
 339         }
 340 }
 341
 342 void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index)
 343 {
 344         int i, remainder, status;
 345         unsigned char *ptr = buffer;
 346         unsigned char operand;
 347         i = blockno / 8;
 348         remainder = blockno % 8;
 349         int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
 350
 351         i = i - (index * blocksize);
 352         if (blocksize != 1024) {
 353                 ptr = ptr + i;
 354                 operand = (1 << remainder);
 355                 status = *ptr & operand;
 356                 if (status)
 357                         *ptr = *ptr & ~(operand);
 358         } else {
 359                 if (remainder == 0) {
 360                         ptr = ptr + i - 1;
 361                         operand = (1 << 7);
 362                 } else {
 363                         ptr = ptr + i;
 364                         operand = (1 << (remainder - 1));
 365                 }
 366                 status = *ptr & operand;
 367                 if (status)
 368                         *ptr = *ptr & ~(operand);
 369         }
 370 }
 371
 372 int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index)
 373 {
 374         int i, remainder, status;
 375         unsigned char *ptr = buffer;
 376         unsigned char operand;
 377
 378         inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group));
 379         i = inode_no / 8;
 380         remainder = inode_no % 8;
 381         if (remainder == 0) {
 382                 ptr = ptr + i - 1;
 383                 operand = (1 << 7);
 384         } else {
 385                 ptr = ptr + i;
 386                 operand = (1 << (remainder - 1));
 387         }
 388         status = *ptr & operand;
 389         if (status)
 390                 return -1;
 391
 392         *ptr = *ptr | operand;
 393
 394         return 0;
 395 }
 396
 397 void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index)
 398 {
 399         int i, remainder, status;
 400         unsigned char *ptr = buffer;
 401         unsigned char operand;
 402
 403         inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group));
 404         i = inode_no / 8;
 405         remainder = inode_no % 8;
 406         if (remainder == 0) {
 407                 ptr = ptr + i - 1;
 408                 operand = (1 << 7);
 409         } else {
 410                 ptr = ptr + i;
 411                 operand = (1 << (remainder - 1));
 412         }
 413         status = *ptr & operand;
 414         if (status)
 415                 *ptr = *ptr & ~(operand);
 416 }
 417
 418 uint16_t ext4fs_checksum_update(uint32_t i)
 419 {
 420         struct ext2_block_group *desc;
 421         struct ext_filesystem *fs = get_fs();
 422         uint16_t crc = 0;
 423         __le32 le32_i = cpu_to_le32(i);
 424
 425         desc = ext4fs_get_group_descriptor(fs, i);
 426         if (le32_to_cpu(fs->sb->feature_ro_compat) & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {
 427                 int offset = offsetof(struct ext2_block_group, bg_checksum);
 428
 429                 crc = ext2fs_crc16(~0, fs->sb->unique_id,
 430                                    sizeof(fs->sb->unique_id));
 431                 crc = ext2fs_crc16(crc, &le32_i, sizeof(le32_i));
 432                 crc = ext2fs_crc16(crc, desc, offset);
 433                 offset += sizeof(desc->bg_checksum);    /* skip checksum */
 434                 assert(offset == sizeof(*desc));
 435                 if (offset < fs->gdsize) {
 436                         crc = ext2fs_crc16(crc, (__u8 *)desc + offset,
 437                                            fs->gdsize - offset);
 438                 }
 439         }
 440
 441         return crc;
 442 }
 443
 444 static int check_void_in_dentry(struct ext2_dirent *dir, char *filename)
 445 {
 446         int dentry_length;
 447         int sizeof_void_space;
 448         int new_entry_byte_reqd;
 449         short padding_factor = 0;
 450
 451         if (dir->namelen % 4 != 0)
 452                 padding_factor = 4 - (dir->namelen % 4);
 453
 454         dentry_length = sizeof(struct ext2_dirent) +
 455                         dir->namelen + padding_factor;
 456         sizeof_void_space = le16_to_cpu(dir->direntlen) - dentry_length;
 457         if (sizeof_void_space == 0)
 458                 return 0;
 459
 460         padding_factor = 0;
 461         if (strlen(filename) % 4 != 0)
 462                 padding_factor = 4 - (strlen(filename) % 4);
 463
 464         new_entry_byte_reqd = strlen(filename) +
 465             sizeof(struct ext2_dirent) + padding_factor;
 466         if (sizeof_void_space >= new_entry_byte_reqd) {
 467                 dir->direntlen = cpu_to_le16(dentry_length);
 468                 return sizeof_void_space;
 469         }
 470
 471         return 0;
 472 }
 473
 474 int ext4fs_update_parent_dentry(char *filename, int file_type)
 475 {
 476         unsigned int *zero_buffer = NULL;
 477         char *root_first_block_buffer = NULL;
 478         int blk_idx;
 479         long int first_block_no_of_root = 0;
 480         int totalbytes = 0;
 481         unsigned int new_entry_byte_reqd;
 482         int sizeof_void_space = 0;
 483         int templength = 0;
 484         int inodeno = -1;
 485         int status;
 486         struct ext_filesystem *fs = get_fs();
 487         /* directory entry */
 488         struct ext2_dirent *dir;
 489         char *temp_dir = NULL;
 490         uint32_t new_blk_no;
 491         uint32_t new_size;
 492         uint32_t new_blockcnt;
 493         uint32_t directory_blocks;
 494
 495         zero_buffer = zalloc(fs->blksz);
 496         if (!zero_buffer) {
 497                 printf("No Memory\n");
 498                 return -1;
 499         }
 500         root_first_block_buffer = zalloc(fs->blksz);
 501         if (!root_first_block_buffer) {
 502                 free(zero_buffer);
 503                 printf("No Memory\n");
 504                 return -1;
 505         }
 506         new_entry_byte_reqd = ROUND(strlen(filename) +
 507                                     sizeof(struct ext2_dirent), 4);
 508 restart:
 509         directory_blocks = le32_to_cpu(g_parent_inode->size) >>
 510                 LOG2_BLOCK_SIZE(ext4fs_root);
 511         blk_idx = directory_blocks - 1;
 512
 513 restart_read:
 514         /* read the block no allocated to a file */
 515         first_block_no_of_root = read_allocated_block(g_parent_inode, blk_idx);
 516         if (first_block_no_of_root <= 0)
 517                 goto fail;
 518
 519         status = ext4fs_devread((lbaint_t)first_block_no_of_root
 520                                 * fs->sect_perblk,
 521                                 0, fs->blksz, root_first_block_buffer);
 522         if (status == 0)
 523                 goto fail;
 524
 525         if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
 526                 goto fail;
 527         dir = (struct ext2_dirent *)root_first_block_buffer;
 528         totalbytes = 0;
 529
 530         while (le16_to_cpu(dir->direntlen) > 0) {
 531                 unsigned short used_len = ROUND(dir->namelen +
 532                     sizeof(struct ext2_dirent), 4);
 533
 534                 /* last entry of block */
 535                 if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) {
 536
 537                         /* check if new entry fits */
 538                         if ((used_len + new_entry_byte_reqd) <=
 539                             le16_to_cpu(dir->direntlen)) {
 540                                 dir->direntlen = cpu_to_le16(used_len);
 541                                 break;
 542                         } else {
 543                                 if (blk_idx > 0) {
 544                                         printf("Block full, trying previous\n");
 545                                         blk_idx--;
 546                                         goto restart_read;
 547                                 }
 548                                 printf("All blocks full: Allocate new\n");
 549
 550                                 if (le32_to_cpu(g_parent_inode->flags) &
 551                                                 EXT4_EXTENTS_FL) {
 552                                         printf("Directory uses extents\n");
 553                                         goto fail;
 554                                 }
 555                                 if (directory_blocks >= INDIRECT_BLOCKS) {
 556                                         printf("Directory exceeds limit\n");
 557                                         goto fail;
 558                                 }
 559                                 new_blk_no = ext4fs_get_new_blk_no();
 560                                 if (new_blk_no == -1) {
 561                                         printf("no block left to assign\n");
 562                                         goto fail;
 563                                 }
 564                                 put_ext4((uint64_t)new_blk_no * fs->blksz, zero_buffer, fs->blksz);
 565                                 g_parent_inode->b.blocks.
 566                                         dir_blocks[directory_blocks] =
 567                                         cpu_to_le32(new_blk_no);
 568
 569                                 new_size = le32_to_cpu(g_parent_inode->size);
 570                                 new_size += fs->blksz;
 571                                 g_parent_inode->size = cpu_to_le32(new_size);
 572
 573                                 new_blockcnt = le32_to_cpu(g_parent_inode->blockcnt);
 574                                 new_blockcnt += fs->sect_perblk;
 575                                 g_parent_inode->blockcnt = cpu_to_le32(new_blockcnt);
 576
 577                                 if (ext4fs_put_metadata
 578                                     (root_first_block_buffer,
 579                                      first_block_no_of_root))
 580                                         goto fail;
 581                                 goto restart;
 582                         }
 583                 }
 584
 585                 templength = le16_to_cpu(dir->direntlen);
 586                 totalbytes = totalbytes + templength;
 587                 sizeof_void_space = check_void_in_dentry(dir, filename);
 588                 if (sizeof_void_space)
 589                         break;
 590
 591                 dir = (struct ext2_dirent *)((char *)dir + templength);
 592         }
 593
 594         /* make a pointer ready for creating next directory entry */
 595         templength = le16_to_cpu(dir->direntlen);
 596         totalbytes = totalbytes + templength;
 597         dir = (struct ext2_dirent *)((char *)dir + templength);
 598
 599         /* get the next available inode number */
 600         inodeno = ext4fs_get_new_inode_no();
 601         if (inodeno == -1) {
 602                 printf("no inode left to assign\n");
 603                 goto fail;
 604         }
 605         dir->inode = cpu_to_le32(inodeno);
 606         if (sizeof_void_space)
 607                 dir->direntlen = cpu_to_le16(sizeof_void_space);
 608         else
 609                 dir->direntlen = cpu_to_le16(fs->blksz - totalbytes);
 610
 611         dir->namelen = strlen(filename);
 612         dir->filetype = FILETYPE_REG;   /* regular file */
 613         temp_dir = (char *)dir;
 614         temp_dir = temp_dir + sizeof(struct ext2_dirent);
 615         memcpy(temp_dir, filename, strlen(filename));
 616
 617         /* update or write  the 1st block of root inode */
 618         if (ext4fs_put_metadata(root_first_block_buffer,
 619                                 first_block_no_of_root))
 620                 goto fail;
 621
 622 fail:
 623         free(zero_buffer);
 624         free(root_first_block_buffer);
 625
 626         return inodeno;
 627 }
 628
 629 static int search_dir(struct ext2_inode *parent_inode, char *dirname)
 630 {
 631         int status;
 632         int inodeno = 0;
 633         int offset;
 634         int blk_idx;
 635         long int blknr;
 636         char *block_buffer = NULL;
 637         struct ext2_dirent *dir = NULL;
 638         struct ext_filesystem *fs = get_fs();
 639         uint32_t directory_blocks;
 640         char *direntname;
 641
 642         directory_blocks = le32_to_cpu(parent_inode->size) >>
 643                 LOG2_BLOCK_SIZE(ext4fs_root);
 644
 645         block_buffer = zalloc(fs->blksz);
 646         if (!block_buffer)
 647                 goto fail;
 648
 649         /* get the block no allocated to a file */
 650         for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
 651                 blknr = read_allocated_block(parent_inode, blk_idx);
 652                 if (blknr <= 0)
 653                         goto fail;
 654
 655                 /* read the directory block */
 656                 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk,
 657                                         0, fs->blksz, (char *)block_buffer);
 658                 if (status == 0)
 659                         goto fail;
 660
 661                 offset = 0;
 662                 do {
 663                         if (offset & 3) {
 664                                 printf("Badly aligned ext2_dirent\n");
 665                                 break;
 666                         }
 667
 668                         dir = (struct ext2_dirent *)(block_buffer + offset);
 669                         direntname = (char*)(dir) + sizeof(struct ext2_dirent);
 670
 671                         int direntlen = le16_to_cpu(dir->direntlen);
 672                         if (direntlen < sizeof(struct ext2_dirent))
 673                                 break;
 674
 675                         if (dir->inode && (strlen(dirname) == dir->namelen) &&
 676                             (strncmp(dirname, direntname, dir->namelen) == 0)) {
 677                                 inodeno = le32_to_cpu(dir->inode);
 678                                 break;
 679                         }
 680
 681                         offset += direntlen;
 682
 683                 } while (offset < fs->blksz);
 684
 685                 if (inodeno > 0) {
 686                         free(block_buffer);
 687                         return inodeno;
 688                 }
 689         }
 690
 691 fail:
 692         free(block_buffer);
 693
 694         return -1;
 695 }
 696
 697 static int find_dir_depth(char *dirname)
 698 {
 699         char *token = strtok(dirname, "/");
 700         int count = 0;
 701         while (token != NULL) {
 702                 token = strtok(NULL, "/");
 703                 count++;
 704         }
 705         return count + 1 + 1;
 706         /*
 707          * for example  for string /home/temp
 708          * depth=home(1)+temp(1)+1 extra for NULL;
 709          * so count is 4;
 710          */
 711 }
 712
 713 static int parse_path(char **arr, char *dirname)
 714 {
 715         char *token = strtok(dirname, "/");
 716         int i = 0;
 717
 718         /* add root */
 719         arr[i] = zalloc(strlen("/") + 1);
 720         if (!arr[i])
 721                 return -ENOMEM;
 722         memcpy(arr[i++], "/", strlen("/"));
 723
 724         /* add each path entry after root */
 725         while (token != NULL) {
 726                 arr[i] = zalloc(strlen(token) + 1);
 727                 if (!arr[i])
 728                         return -ENOMEM;
 729                 memcpy(arr[i++], token, strlen(token));
 730                 token = strtok(NULL, "/");
 731         }
 732         arr[i] = NULL;
 733
 734         return 0;
 735 }
 736
 737 int ext4fs_iget(int inode_no, struct ext2_inode *inode)
 738 {
 739         if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0)
 740                 return -1;
 741
 742         return 0;
 743 }
 744
 745 /*
 746  * Function: ext4fs_get_parent_inode_num
 747  * Return Value: inode Number of the parent directory of  file/Directory to be
 748  * created
 749  * dirname : Input parmater, input path name of the file/directory to be created
 750  * dname : Output parameter, to be filled with the name of the directory
 751  * extracted from dirname
 752  */
 753 int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags)
 754 {
 755         int i;
 756         int depth = 0;
 757         int matched_inode_no;
 758         int result_inode_no = -1;
 759         char **ptr = NULL;
 760         char *depth_dirname = NULL;
 761         char *parse_dirname = NULL;
 762         struct ext2_inode *parent_inode = NULL;
 763         struct ext2_inode *first_inode = NULL;
 764         struct ext2_inode temp_inode;
 765
 766         if (*dirname != '/') {
 767                 printf("Please supply Absolute path\n");
 768                 return -1;
 769         }
 770
 771         /* TODO: input validation make equivalent to linux */
 772         depth_dirname = zalloc(strlen(dirname) + 1);
 773         if (!depth_dirname)
 774                 return -ENOMEM;
 775
 776         memcpy(depth_dirname, dirname, strlen(dirname));
 777         depth = find_dir_depth(depth_dirname);
 778         parse_dirname = zalloc(strlen(dirname) + 1);
 779         if (!parse_dirname)
 780                 goto fail;
 781         memcpy(parse_dirname, dirname, strlen(dirname));
 782
 783         /* allocate memory for each directory level */
 784         ptr = zalloc((depth) * sizeof(char *));
 785         if (!ptr)
 786                 goto fail;
 787         if (parse_path(ptr, parse_dirname))
 788                 goto fail;
 789         parent_inode = zalloc(sizeof(struct ext2_inode));
 790         if (!parent_inode)
 791                 goto fail;
 792         first_inode = zalloc(sizeof(struct ext2_inode));
 793         if (!first_inode)
 794                 goto fail;
 795         memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode));
 796         memcpy(first_inode, parent_inode, sizeof(struct ext2_inode));
 797         if (flags & F_FILE)
 798                 result_inode_no = EXT2_ROOT_INO;
 799         for (i = 1; i < depth; i++) {
 800                 matched_inode_no = search_dir(parent_inode, ptr[i]);
 801                 if (matched_inode_no == -1) {
 802                         if (ptr[i + 1] == NULL && i == 1) {
 803                                 result_inode_no = EXT2_ROOT_INO;
 804                                 goto end;
 805                         } else {
 806                                 if (ptr[i + 1] == NULL)
 807                                         break;
 808                                 printf("Invalid path\n");
 809                                 result_inode_no = -1;
 810                                 goto fail;
 811                         }
 812                 } else {
 813                         if (ptr[i + 1] != NULL) {
 814                                 memset(parent_inode, '\0',
 815                                        sizeof(struct ext2_inode));
 816                                 if (ext4fs_iget(matched_inode_no,
 817                                                 parent_inode)) {
 818                                         result_inode_no = -1;
 819                                         goto fail;
 820                                 }
 821                                 result_inode_no = matched_inode_no;
 822                         } else {
 823                                 break;
 824                         }
 825                 }
 826         }
 827
 828 end:
 829         if (i == 1)
 830                 matched_inode_no = search_dir(first_inode, ptr[i]);
 831         else
 832                 matched_inode_no = search_dir(parent_inode, ptr[i]);
 833
 834         if (matched_inode_no != -1) {
 835                 ext4fs_iget(matched_inode_no, &temp_inode);
 836                 if (le16_to_cpu(temp_inode.mode) & S_IFDIR) {
 837                         printf("It is a Directory\n");
 838                         result_inode_no = -1;
 839                         goto fail;
 840                 }
 841         }
 842
 843         if (strlen(ptr[i]) > 256) {
 844                 result_inode_no = -1;
 845                 goto fail;
 846         }
 847         memcpy(dname, ptr[i], strlen(ptr[i]));
 848
 849 fail:
 850         free(depth_dirname);
 851         free(parse_dirname);
 852         for (i = 0; i < depth; i++) {
 853                 if (!ptr[i])
 854                         break;
 855                 free(ptr[i]);
 856         }
 857         free(ptr);
 858         free(parent_inode);
 859         free(first_inode);
 860
 861         return result_inode_no;
 862 }
 863
 864 static int unlink_filename(char *filename, unsigned int blknr)
 865 {
 866         int status;
 867         int inodeno = 0;
 868         int offset;
 869         char *block_buffer = NULL;
 870         struct ext2_dirent *dir = NULL;
 871         struct ext2_dirent *previous_dir;
 872         struct ext_filesystem *fs = get_fs();
 873         int ret = -1;
 874         char *direntname;
 875
 876         block_buffer = zalloc(fs->blksz);
 877         if (!block_buffer)
 878                 return -ENOMEM;
 879
 880         /* read the directory block */
 881         status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
 882                                 fs->blksz, block_buffer);
 883         if (status == 0)
 884                 goto fail;
 885
 886         offset = 0;
 887         do {
 888                 if (offset & 3) {
 889                         printf("Badly aligned ext2_dirent\n");
 890                         break;
 891                 }
 892
 893                 previous_dir = dir;
 894                 dir = (struct ext2_dirent *)(block_buffer + offset);
 895                 direntname = (char *)(dir) + sizeof(struct ext2_dirent);
 896
 897                 int direntlen = le16_to_cpu(dir->direntlen);
 898                 if (direntlen < sizeof(struct ext2_dirent))
 899                         break;
 900
 901                 if (dir->inode && (strlen(filename) == dir->namelen) &&
 902                     (strncmp(direntname, filename, dir->namelen) == 0)) {
 903                         inodeno = le32_to_cpu(dir->inode);
 904                         break;
 905                 }
 906
 907                 offset += direntlen;
 908
 909         } while (offset < fs->blksz);
 910
 911         if (inodeno > 0) {
 912                 printf("file found, deleting\n");
 913                 if (ext4fs_log_journal(block_buffer, blknr))
 914                         goto fail;
 915
 916                 if (previous_dir) {
 917                         /* merge dir entry with predecessor */
 918                         uint16_t new_len;
 919                         new_len = le16_to_cpu(previous_dir->direntlen);
 920                         new_len += le16_to_cpu(dir->direntlen);
 921                         previous_dir->direntlen = cpu_to_le16(new_len);
 922                 } else {
 923                         /* invalidate dir entry */
 924                         dir->inode = 0;
 925                 }
 926                 if (ext4fs_put_metadata(block_buffer, blknr))
 927                         goto fail;
 928                 ret = inodeno;
 929         }
 930 fail:
 931         free(block_buffer);
 932
 933         return ret;
 934 }
 935
 936 int ext4fs_filename_unlink(char *filename)
 937 {
 938         int blk_idx;
 939         long int blknr = -1;
 940         int inodeno = -1;
 941         uint32_t directory_blocks;
 942
 943         directory_blocks = le32_to_cpu(g_parent_inode->size) >>
 944                 LOG2_BLOCK_SIZE(ext4fs_root);
 945
 946         /* read the block no allocated to a file */
 947         for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
 948                 blknr = read_allocated_block(g_parent_inode, blk_idx);
 949                 if (blknr <= 0)
 950                         break;
 951                 inodeno = unlink_filename(filename, blknr);
 952                 if (inodeno != -1)
 953                         return inodeno;
 954         }
 955
 956         return -1;
 957 }
 958
 959 uint32_t ext4fs_get_new_blk_no(void)
 960 {
 961         short i;
 962         short status;
 963         int remainder;
 964         unsigned int bg_idx;
 965         static int prev_bg_bitmap_index = -1;
 966         unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
 967         struct ext_filesystem *fs = get_fs();
 968         char *journal_buffer = zalloc(fs->blksz);
 969         char *zero_buffer = zalloc(fs->blksz);
 970         if (!journal_buffer || !zero_buffer)
 971                 goto fail;
 972
 973         if (fs->first_pass_bbmap == 0) {
 974                 for (i = 0; i < fs->no_blkgrp; i++) {
 975                         struct ext2_block_group *bgd = NULL;
 976                         bgd = ext4fs_get_group_descriptor(fs, i);
 977                         if (ext4fs_bg_get_free_blocks(bgd, fs)) {
 978                                 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
 979                                 uint64_t b_bitmap_blk =
 980                                         ext4fs_bg_get_block_id(bgd, fs);
 981                                 if (bg_flags & EXT4_BG_BLOCK_UNINIT) {
 982                                         memcpy(fs->blk_bmaps[i], zero_buffer,
 983                                                fs->blksz);
 984                                         put_ext4(b_bitmap_blk * fs->blksz,
 985                                                  fs->blk_bmaps[i], fs->blksz);
 986                                         bg_flags &= ~EXT4_BG_BLOCK_UNINIT;
 987                                         ext4fs_bg_set_flags(bgd, bg_flags);
 988                                 }
 989                                 fs->curr_blkno =
 990                                     _get_new_blk_no(fs->blk_bmaps[i]);
 991                                 if (fs->curr_blkno == -1)
 992                                         /* block bitmap is completely filled */
 993                                         continue;
 994                                 fs->curr_blkno = fs->curr_blkno +
 995                                                 (i * fs->blksz * 8);
 996                                 fs->first_pass_bbmap++;
 997                                 ext4fs_bg_free_blocks_dec(bgd, fs);
 998                                 ext4fs_sb_free_blocks_dec(fs->sb);
 999                                 status = ext4fs_devread(b_bitmap_blk *
1000                                                         fs->sect_perblk,
1001                                                         0, fs->blksz,
1002                                                         journal_buffer);
1003                                 if (status == 0)
1004                                         goto fail;
1005                                 if (ext4fs_log_journal(journal_buffer,
1006                                                        b_bitmap_blk))
1007                                         goto fail;
1008                                 goto success;
1009                         } else {
1010                                 debug("no space left on block group %d\n", i);
1011                         }
1012                 }
1013
1014                 goto fail;
1015         } else {
1016                 fs->curr_blkno++;
1017 restart:
1018                 /* get the blockbitmap index respective to blockno */
1019                 bg_idx = fs->curr_blkno / blk_per_grp;
1020                 if (fs->blksz == 1024) {
1021                         remainder = fs->curr_blkno % blk_per_grp;
1022                         if (!remainder)
1023                                 bg_idx--;
1024                 }
1025
1026                 /*
1027                  * To skip completely filled block group bitmaps
1028                  * Optimize the block allocation
1029                  */
1030                 if (bg_idx >= fs->no_blkgrp)
1031                         goto fail;
1032
1033                 struct ext2_block_group *bgd = NULL;
1034                 bgd = ext4fs_get_group_descriptor(fs, bg_idx);
1035                 if (ext4fs_bg_get_free_blocks(bgd, fs) == 0) {
1036                         debug("block group %u is full. Skipping\n", bg_idx);
1037                         fs->curr_blkno = (bg_idx + 1) * blk_per_grp;
1038                         if (fs->blksz == 1024)
1039                                 fs->curr_blkno += 1;
1040                         goto restart;
1041                 }
1042
1043                 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1044                 uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs);
1045                 if (bg_flags & EXT4_BG_BLOCK_UNINIT) {
1046                         memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz);
1047                         put_ext4(b_bitmap_blk * fs->blksz,
1048                                  zero_buffer, fs->blksz);
1049                         bg_flags &= ~EXT4_BG_BLOCK_UNINIT;
1050                         ext4fs_bg_set_flags(bgd, bg_flags);
1051                 }
1052
1053                 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx],
1054                                    bg_idx) != 0) {
1055                         debug("going for restart for the block no %ld %u\n",
1056                               fs->curr_blkno, bg_idx);
1057                         fs->curr_blkno++;
1058                         goto restart;
1059                 }
1060
1061                 /* journal backup */
1062                 if (prev_bg_bitmap_index != bg_idx) {
1063                         status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk,
1064                                                 0, fs->blksz, journal_buffer);
1065                         if (status == 0)
1066                                 goto fail;
1067                         if (ext4fs_log_journal(journal_buffer, b_bitmap_blk))
1068                                 goto fail;
1069
1070                         prev_bg_bitmap_index = bg_idx;
1071                 }
1072                 ext4fs_bg_free_blocks_dec(bgd, fs);
1073                 ext4fs_sb_free_blocks_dec(fs->sb);
1074                 goto success;
1075         }
1076 success:
1077         free(journal_buffer);
1078         free(zero_buffer);
1079
1080         return fs->curr_blkno;
1081 fail:
1082         free(journal_buffer);
1083         free(zero_buffer);
1084
1085         return -1;
1086 }
1087
1088 int ext4fs_get_new_inode_no(void)
1089 {
1090         short i;
1091         short status;
1092         unsigned int ibmap_idx;
1093         static int prev_inode_bitmap_index = -1;
1094         unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
1095         struct ext_filesystem *fs = get_fs();
1096         char *journal_buffer = zalloc(fs->blksz);
1097         char *zero_buffer = zalloc(fs->blksz);
1098         if (!journal_buffer || !zero_buffer)
1099                 goto fail;
1100         int has_gdt_chksum = le32_to_cpu(fs->sb->feature_ro_compat) &
1101                 EXT4_FEATURE_RO_COMPAT_GDT_CSUM ? 1 : 0;
1102
1103         if (fs->first_pass_ibmap == 0) {
1104                 for (i = 0; i < fs->no_blkgrp; i++) {
1105                         uint32_t free_inodes;
1106                         struct ext2_block_group *bgd = NULL;
1107                         bgd = ext4fs_get_group_descriptor(fs, i);
1108                         free_inodes = ext4fs_bg_get_free_inodes(bgd, fs);
1109                         if (free_inodes) {
1110                                 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1111                                 uint64_t i_bitmap_blk =
1112                                         ext4fs_bg_get_inode_id(bgd, fs);
1113                                 if (has_gdt_chksum)
1114                                         bgd->bg_itable_unused = free_inodes;
1115                                 if (bg_flags & EXT4_BG_INODE_UNINIT) {
1116                                         put_ext4(i_bitmap_blk * fs->blksz,
1117                                                  zero_buffer, fs->blksz);
1118                                         bg_flags &= ~EXT4_BG_INODE_UNINIT;
1119                                         ext4fs_bg_set_flags(bgd, bg_flags);
1120                                         memcpy(fs->inode_bmaps[i],
1121                                                zero_buffer, fs->blksz);
1122                                 }
1123                                 fs->curr_inode_no =
1124                                     _get_new_inode_no(fs->inode_bmaps[i]);
1125                                 if (fs->curr_inode_no == -1)
1126                                         /* inode bitmap is completely filled */
1127                                         continue;
1128                                 fs->curr_inode_no = fs->curr_inode_no +
1129                                                         (i * inodes_per_grp);
1130                                 fs->first_pass_ibmap++;
1131                                 ext4fs_bg_free_inodes_dec(bgd, fs);
1132                                 if (has_gdt_chksum)
1133                                         ext4fs_bg_itable_unused_dec(bgd, fs);
1134                                 ext4fs_sb_free_inodes_dec(fs->sb);
1135                                 status = ext4fs_devread(i_bitmap_blk *
1136                                                         fs->sect_perblk,
1137                                                         0, fs->blksz,
1138                                                         journal_buffer);
1139                                 if (status == 0)
1140                                         goto fail;
1141                                 if (ext4fs_log_journal(journal_buffer,
1142                                                        i_bitmap_blk))
1143                                         goto fail;
1144                                 goto success;
1145                         } else
1146                                 debug("no inode left on block group %d\n", i);
1147                 }
1148                 goto fail;
1149         } else {
1150 restart:
1151                 fs->curr_inode_no++;
1152                 /* get the blockbitmap index respective to blockno */
1153                 ibmap_idx = fs->curr_inode_no / inodes_per_grp;
1154                 struct ext2_block_group *bgd =
1155                         ext4fs_get_group_descriptor(fs, ibmap_idx);
1156                 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1157                 uint64_t i_bitmap_blk = ext4fs_bg_get_inode_id(bgd, fs);
1158
1159                 if (bg_flags & EXT4_BG_INODE_UNINIT) {
1160                         put_ext4(i_bitmap_blk * fs->blksz,
1161                                  zero_buffer, fs->blksz);
1162                         bg_flags &= ~EXT4_BG_INODE_UNINIT;
1163                         ext4fs_bg_set_flags(bgd, bg_flags);
1164                         memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer,
1165                                 fs->blksz);
1166                 }
1167
1168                 if (ext4fs_set_inode_bmap(fs->curr_inode_no,
1169                                           fs->inode_bmaps[ibmap_idx],
1170                                           ibmap_idx) != 0) {
1171                         debug("going for restart for the block no %d %u\n",
1172                               fs->curr_inode_no, ibmap_idx);
1173                         goto restart;
1174                 }
1175
1176                 /* journal backup */
1177                 if (prev_inode_bitmap_index != ibmap_idx) {
1178                         status = ext4fs_devread(i_bitmap_blk * fs->sect_perblk,
1179                                                 0, fs->blksz, journal_buffer);
1180                         if (status == 0)
1181                                 goto fail;
1182                         if (ext4fs_log_journal(journal_buffer,
1183                                                 le32_to_cpu(bgd->inode_id)))
1184                                 goto fail;
1185                         prev_inode_bitmap_index = ibmap_idx;
1186                 }
1187                 ext4fs_bg_free_inodes_dec(bgd, fs);
1188                 if (has_gdt_chksum)
1189                         bgd->bg_itable_unused = bgd->free_inodes;
1190                 ext4fs_sb_free_inodes_dec(fs->sb);
1191                 goto success;
1192         }
1193
1194 success:
1195         free(journal_buffer);
1196         free(zero_buffer);
1197
1198         return fs->curr_inode_no;
1199 fail:
1200         free(journal_buffer);
1201         free(zero_buffer);
1202
1203         return -1;
1204
1205 }
1206
1207
1208 static void alloc_single_indirect_block(struct ext2_inode *file_inode,
1209                                         unsigned int *total_remaining_blocks,
1210                                         unsigned int *no_blks_reqd)
1211 {
1212         short i;
1213         short status;
1214         long int actual_block_no;
1215         long int si_blockno;
1216         /* si :single indirect */
1217         __le32 *si_buffer = NULL;
1218         __le32 *si_start_addr = NULL;
1219         struct ext_filesystem *fs = get_fs();
1220
1221         if (*total_remaining_blocks != 0) {
1222                 si_buffer = zalloc(fs->blksz);
1223                 if (!si_buffer) {
1224                         printf("No Memory\n");
1225                         return;
1226                 }
1227                 si_start_addr = si_buffer;
1228                 si_blockno = ext4fs_get_new_blk_no();
1229                 if (si_blockno == -1) {
1230                         printf("no block left to assign\n");
1231                         goto fail;
1232                 }
1233                 (*no_blks_reqd)++;
1234                 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks);
1235
1236                 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk,
1237                                         0, fs->blksz, (char *)si_buffer);
1238                 memset(si_buffer, '\0', fs->blksz);
1239                 if (status == 0)
1240                         goto fail;
1241
1242                 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1243                         actual_block_no = ext4fs_get_new_blk_no();
1244                         if (actual_block_no == -1) {
1245                                 printf("no block left to assign\n");
1246                                 goto fail;
1247                         }
1248                         *si_buffer = cpu_to_le32(actual_block_no);
1249                         debug("SIAB %u: %u\n", *si_buffer,
1250                                 *total_remaining_blocks);
1251
1252                         si_buffer++;
1253                         (*total_remaining_blocks)--;
1254                         if (*total_remaining_blocks == 0)
1255                                 break;
1256                 }
1257
1258                 /* write the block to disk */
1259                 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)),
1260                          si_start_addr, fs->blksz);
1261                 file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno);
1262         }
1263 fail:
1264         free(si_start_addr);
1265 }
1266
1267 static void alloc_double_indirect_block(struct ext2_inode *file_inode,
1268                                         unsigned int *total_remaining_blocks,
1269                                         unsigned int *no_blks_reqd)
1270 {
1271         short i;
1272         short j;
1273         short status;
1274         long int actual_block_no;
1275         /* di:double indirect */
1276         long int di_blockno_parent;
1277         long int di_blockno_child;
1278         __le32 *di_parent_buffer = NULL;
1279         __le32 *di_child_buff = NULL;
1280         __le32 *di_block_start_addr = NULL;
1281         __le32 *di_child_buff_start = NULL;
1282         struct ext_filesystem *fs = get_fs();
1283
1284         if (*total_remaining_blocks != 0) {
1285                 /* double indirect parent block connecting to inode */
1286                 di_blockno_parent = ext4fs_get_new_blk_no();
1287                 if (di_blockno_parent == -1) {
1288                         printf("no block left to assign\n");
1289                         goto fail;
1290                 }
1291                 di_parent_buffer = zalloc(fs->blksz);
1292                 if (!di_parent_buffer)
1293                         goto fail;
1294
1295                 di_block_start_addr = di_parent_buffer;
1296                 (*no_blks_reqd)++;
1297                 debug("DIPB %ld: %u\n", di_blockno_parent,
1298                       *total_remaining_blocks);
1299
1300                 status = ext4fs_devread((lbaint_t)di_blockno_parent *
1301                                         fs->sect_perblk, 0,
1302                                         fs->blksz, (char *)di_parent_buffer);
1303
1304                 if (!status) {
1305                         printf("%s: Device read error!\n", __func__);
1306                         goto fail;
1307                 }
1308                 memset(di_parent_buffer, '\0', fs->blksz);
1309
1310                 /*
1311                  * start:for each double indirect parent
1312                  * block create one more block
1313                  */
1314                 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1315                         di_blockno_child = ext4fs_get_new_blk_no();
1316                         if (di_blockno_child == -1) {
1317                                 printf("no block left to assign\n");
1318                                 goto fail;
1319                         }
1320                         di_child_buff = zalloc(fs->blksz);
1321                         if (!di_child_buff)
1322                                 goto fail;
1323
1324                         di_child_buff_start = di_child_buff;
1325                         *di_parent_buffer = cpu_to_le32(di_blockno_child);
1326                         di_parent_buffer++;
1327                         (*no_blks_reqd)++;
1328                         debug("DICB %ld: %u\n", di_blockno_child,
1329                               *total_remaining_blocks);
1330
1331                         status = ext4fs_devread((lbaint_t)di_blockno_child *
1332                                                 fs->sect_perblk, 0,
1333                                                 fs->blksz,
1334                                                 (char *)di_child_buff);
1335
1336                         if (!status) {
1337                                 printf("%s: Device read error!\n", __func__);
1338                                 goto fail;
1339                         }
1340                         memset(di_child_buff, '\0', fs->blksz);
1341                         /* filling of actual datablocks for each child */
1342                         for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1343                                 actual_block_no = ext4fs_get_new_blk_no();
1344                                 if (actual_block_no == -1) {
1345                                         printf("no block left to assign\n");
1346                                         goto fail;
1347                                 }
1348                                 *di_child_buff = cpu_to_le32(actual_block_no);
1349                                 debug("DIAB %ld: %u\n", actual_block_no,
1350                                       *total_remaining_blocks);
1351
1352                                 di_child_buff++;
1353                                 (*total_remaining_blocks)--;
1354                                 if (*total_remaining_blocks == 0)
1355                                         break;
1356                         }
1357                         /* write the block  table */
1358                         put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)),
1359                                  di_child_buff_start, fs->blksz);
1360                         free(di_child_buff_start);
1361                         di_child_buff_start = NULL;
1362
1363                         if (*total_remaining_blocks == 0)
1364                                 break;
1365                 }
1366                 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)),
1367                          di_block_start_addr, fs->blksz);
1368                 file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent);
1369         }
1370 fail:
1371         free(di_block_start_addr);
1372 }
1373
1374 static void alloc_triple_indirect_block(struct ext2_inode *file_inode,
1375                                         unsigned int *total_remaining_blocks,
1376                                         unsigned int *no_blks_reqd)
1377 {
1378         short i;
1379         short j;
1380         short k;
1381         long int actual_block_no;
1382         /* ti: Triple Indirect */
1383         long int ti_gp_blockno;
1384         long int ti_parent_blockno;
1385         long int ti_child_blockno;
1386         __le32 *ti_gp_buff = NULL;
1387         __le32 *ti_parent_buff = NULL;
1388         __le32 *ti_child_buff = NULL;
1389         __le32 *ti_gp_buff_start_addr = NULL;
1390         __le32 *ti_pbuff_start_addr = NULL;
1391         __le32 *ti_cbuff_start_addr = NULL;
1392         struct ext_filesystem *fs = get_fs();
1393         if (*total_remaining_blocks != 0) {
1394                 /* triple indirect grand parent block connecting to inode */
1395                 ti_gp_blockno = ext4fs_get_new_blk_no();
1396                 if (ti_gp_blockno == -1) {
1397                         printf("no block left to assign\n");
1398                         return;
1399                 }
1400                 ti_gp_buff = zalloc(fs->blksz);
1401                 if (!ti_gp_buff)
1402                         return;
1403
1404                 ti_gp_buff_start_addr = ti_gp_buff;
1405                 (*no_blks_reqd)++;
1406                 debug("TIGPB %ld: %u\n", ti_gp_blockno,
1407                       *total_remaining_blocks);
1408
1409                 /* for each 4 byte grand parent entry create one more block */
1410                 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1411                         ti_parent_blockno = ext4fs_get_new_blk_no();
1412                         if (ti_parent_blockno == -1) {
1413                                 printf("no block left to assign\n");
1414                                 goto fail;
1415                         }
1416                         ti_parent_buff = zalloc(fs->blksz);
1417                         if (!ti_parent_buff)
1418                                 goto fail;
1419
1420                         ti_pbuff_start_addr = ti_parent_buff;
1421                         *ti_gp_buff = cpu_to_le32(ti_parent_blockno);
1422                         ti_gp_buff++;
1423                         (*no_blks_reqd)++;
1424                         debug("TIPB %ld: %u\n", ti_parent_blockno,
1425                               *total_remaining_blocks);
1426
1427                         /* for each 4 byte entry parent create one more block */
1428                         for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1429                                 ti_child_blockno = ext4fs_get_new_blk_no();
1430                                 if (ti_child_blockno == -1) {
1431                                         printf("no block left assign\n");
1432                                         goto fail1;
1433                                 }
1434                                 ti_child_buff = zalloc(fs->blksz);
1435                                 if (!ti_child_buff)
1436                                         goto fail1;
1437
1438                                 ti_cbuff_start_addr = ti_child_buff;
1439                                 *ti_parent_buff = cpu_to_le32(ti_child_blockno);
1440                                 ti_parent_buff++;
1441                                 (*no_blks_reqd)++;
1442                                 debug("TICB %ld: %u\n", ti_parent_blockno,
1443                                       *total_remaining_blocks);
1444
1445                                 /* fill actual datablocks for each child */
1446                                 for (k = 0; k < (fs->blksz / sizeof(int));
1447                                         k++) {
1448                                         actual_block_no =
1449                                             ext4fs_get_new_blk_no();
1450                                         if (actual_block_no == -1) {
1451                                                 printf("no block left\n");
1452                                                 free(ti_cbuff_start_addr);
1453                                                 goto fail1;
1454                                         }
1455                                         *ti_child_buff = cpu_to_le32(actual_block_no);
1456                                         debug("TIAB %ld: %u\n", actual_block_no,
1457                                               *total_remaining_blocks);
1458
1459                                         ti_child_buff++;
1460                                         (*total_remaining_blocks)--;
1461                                         if (*total_remaining_blocks == 0)
1462                                                 break;
1463                                 }
1464                                 /* write the child block */
1465                                 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno *
1466                                                       (uint64_t)fs->blksz)),
1467                                          ti_cbuff_start_addr, fs->blksz);
1468                                 free(ti_cbuff_start_addr);
1469
1470                                 if (*total_remaining_blocks == 0)
1471                                         break;
1472                         }
1473                         /* write the parent block */
1474                         put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)),
1475                                  ti_pbuff_start_addr, fs->blksz);
1476                         free(ti_pbuff_start_addr);
1477
1478                         if (*total_remaining_blocks == 0)
1479                                 break;
1480                 }
1481                 /* write the grand parent block */
1482                 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)),
1483                          ti_gp_buff_start_addr, fs->blksz);
1484                 file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno);
1485                 free(ti_gp_buff_start_addr);
1486                 return;
1487         }
1488 fail1:
1489         free(ti_pbuff_start_addr);
1490 fail:
1491         free(ti_gp_buff_start_addr);
1492 }
1493
1494 void ext4fs_allocate_blocks(struct ext2_inode *file_inode,
1495                                 unsigned int total_remaining_blocks,
1496                                 unsigned int *total_no_of_block)
1497 {
1498         short i;
1499         long int direct_blockno;
1500         unsigned int no_blks_reqd = 0;
1501
1502         /* allocation of direct blocks */
1503         for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) {
1504                 direct_blockno = ext4fs_get_new_blk_no();
1505                 if (direct_blockno == -1) {
1506                         printf("no block left to assign\n");
1507                         return;
1508                 }
1509                 file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno);
1510                 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks);
1511
1512                 total_remaining_blocks--;
1513         }
1514
1515         alloc_single_indirect_block(file_inode, &total_remaining_blocks,
1516                                     &no_blks_reqd);
1517         alloc_double_indirect_block(file_inode, &total_remaining_blocks,
1518                                     &no_blks_reqd);
1519         alloc_triple_indirect_block(file_inode, &total_remaining_blocks,
1520                                     &no_blks_reqd);
1521         *total_no_of_block += no_blks_reqd;
1522 }
1523
1524 #endif
1525
1526 static struct ext4_extent_header *ext4fs_get_extent_block
1527         (struct ext2_data *data, char *buf,
1528                 struct ext4_extent_header *ext_block,
1529                 uint32_t fileblock, int log2_blksz)
1530 {
1531         struct ext4_extent_idx *index;
1532         unsigned long long block;
1533         int blksz = EXT2_BLOCK_SIZE(data);
1534         int i;
1535
1536         while (1) {
1537                 index = (struct ext4_extent_idx *)(ext_block + 1);
1538
1539                 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
1540                         return NULL;
1541
1542                 if (ext_block->eh_depth == 0)
1543                         return ext_block;
1544                 i = -1;
1545                 do {
1546                         i++;
1547                         if (i >= le16_to_cpu(ext_block->eh_entries))
1548                                 break;
1549                 } while (fileblock >= le32_to_cpu(index[i].ei_block));
1550
1551                 if (--i < 0)
1552                         return NULL;
1553
1554                 block = le16_to_cpu(index[i].ei_leaf_hi);
1555                 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
1556
1557                 if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz,
1558                                    buf))
1559                         ext_block = (struct ext4_extent_header *)buf;
1560                 else
1561                         return NULL;
1562         }
1563 }
1564
1565 static int ext4fs_blockgroup
1566         (struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
1567 {
1568         long int blkno;
1569         unsigned int blkoff, desc_per_blk;
1570         int log2blksz = get_fs()->dev_desc->log2blksz;
1571         int desc_size = get_fs()->gdsize;
1572
1573         desc_per_blk = EXT2_BLOCK_SIZE(data) / desc_size;
1574
1575         blkno = le32_to_cpu(data->sblock.first_data_block) + 1 +
1576                         group / desc_per_blk;
1577         blkoff = (group % desc_per_blk) * desc_size;
1578
1579         debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1580               group, blkno, blkoff);
1581
1582         return ext4fs_devread((lbaint_t)blkno <<
1583                               (LOG2_BLOCK_SIZE(data) - log2blksz),
1584                               blkoff, desc_size, (char *)blkgrp);
1585 }
1586
1587 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
1588 {
1589         struct ext2_block_group blkgrp;
1590         struct ext2_sblock *sblock = &data->sblock;
1591         struct ext_filesystem *fs = get_fs();
1592         int log2blksz = get_fs()->dev_desc->log2blksz;
1593         int inodes_per_block, status;
1594         long int blkno;
1595         unsigned int blkoff;
1596
1597         /* It is easier to calculate if the first inode is 0. */
1598         ino--;
1599         status = ext4fs_blockgroup(data, ino / le32_to_cpu
1600                                    (sblock->inodes_per_group), &blkgrp);
1601         if (status == 0)
1602                 return 0;
1603
1604         inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
1605         blkno = ext4fs_bg_get_inode_table_id(&blkgrp, fs) +
1606             (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1607         blkoff = (ino % inodes_per_block) * fs->inodesz;
1608         /* Read the inode. */
1609         status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) -
1610                                 log2blksz), blkoff,
1611                                 sizeof(struct ext2_inode), (char *)inode);
1612         if (status == 0)
1613                 return 0;
1614
1615         return 1;
1616 }
1617
1618 long int read_allocated_block(struct ext2_inode *inode, int fileblock)
1619 {
1620         long int blknr;
1621         int blksz;
1622         int log2_blksz;
1623         int status;
1624         long int rblock;
1625         long int perblock_parent;
1626         long int perblock_child;
1627         unsigned long long start;
1628         /* get the blocksize of the filesystem */
1629         blksz = EXT2_BLOCK_SIZE(ext4fs_root);
1630         log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
1631                 - get_fs()->dev_desc->log2blksz;
1632
1633         if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
1634                 long int startblock, endblock;
1635                 char *buf = zalloc(blksz);
1636                 if (!buf)
1637                         return -ENOMEM;
1638                 struct ext4_extent_header *ext_block;
1639                 struct ext4_extent *extent;
1640                 int i;
1641                 ext_block =
1642                         ext4fs_get_extent_block(ext4fs_root, buf,
1643                                                 (struct ext4_extent_header *)
1644                                                 inode->b.blocks.dir_blocks,
1645                                                 fileblock, log2_blksz);
1646                 if (!ext_block) {
1647                         printf("invalid extent block\n");
1648                         free(buf);
1649                         return -EINVAL;
1650                 }
1651
1652                 extent = (struct ext4_extent *)(ext_block + 1);
1653
1654                 for (i = 0; i < le16_to_cpu(ext_block->eh_entries); i++) {
1655                         startblock = le32_to_cpu(extent[i].ee_block);
1656                         endblock = startblock + le16_to_cpu(extent[i].ee_len);
1657
1658                         if (startblock > fileblock) {
1659                                 /* Sparse file */
1660                                 free(buf);
1661                                 return 0;
1662
1663                         } else if (fileblock < endblock) {
1664                                 start = le16_to_cpu(extent[i].ee_start_hi);
1665                                 start = (start << 32) +
1666                                         le32_to_cpu(extent[i].ee_start_lo);
1667                                 free(buf);
1668                                 return (fileblock - startblock) + start;
1669                         }
1670                 }
1671
1672                 free(buf);
1673                 return 0;
1674         }
1675
1676         /* Direct blocks. */
1677         if (fileblock < INDIRECT_BLOCKS)
1678                 blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
1679
1680         /* Indirect. */
1681         else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
1682                 if (ext4fs_indir1_block == NULL) {
1683                         ext4fs_indir1_block = zalloc(blksz);
1684                         if (ext4fs_indir1_block == NULL) {
1685                                 printf("** SI ext2fs read block (indir 1)"
1686                                         "malloc failed. **\n");
1687                                 return -1;
1688                         }
1689                         ext4fs_indir1_size = blksz;
1690                         ext4fs_indir1_blkno = -1;
1691                 }
1692                 if (blksz != ext4fs_indir1_size) {
1693                         free(ext4fs_indir1_block);
1694                         ext4fs_indir1_block = NULL;
1695                         ext4fs_indir1_size = 0;
1696                         ext4fs_indir1_blkno = -1;
1697                         ext4fs_indir1_block = zalloc(blksz);
1698                         if (ext4fs_indir1_block == NULL) {
1699                                 printf("** SI ext2fs read block (indir 1):"
1700                                         "malloc failed. **\n");
1701                                 return -1;
1702                         }
1703                         ext4fs_indir1_size = blksz;
1704                 }
1705                 if ((le32_to_cpu(inode->b.blocks.indir_block) <<
1706                      log2_blksz) != ext4fs_indir1_blkno) {
1707                         status =
1708                             ext4fs_devread((lbaint_t)le32_to_cpu
1709                                            (inode->b.blocks.
1710                                             indir_block) << log2_blksz, 0,
1711                                            blksz, (char *)ext4fs_indir1_block);
1712                         if (status == 0) {
1713                                 printf("** SI ext2fs read block (indir 1)"
1714                                         "failed. **\n");
1715                                 return -1;
1716                         }
1717                         ext4fs_indir1_blkno =
1718                                 le32_to_cpu(inode->b.blocks.
1719                                                indir_block) << log2_blksz;
1720                 }
1721                 blknr = le32_to_cpu(ext4fs_indir1_block
1722                                       [fileblock - INDIRECT_BLOCKS]);
1723         }
1724         /* Double indirect. */
1725         else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
1726                                         (blksz / 4 + 1)))) {
1727
1728                 long int perblock = blksz / 4;
1729                 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
1730
1731                 if (ext4fs_indir1_block == NULL) {
1732                         ext4fs_indir1_block = zalloc(blksz);
1733                         if (ext4fs_indir1_block == NULL) {
1734                                 printf("** DI ext2fs read block (indir 2 1)"
1735                                         "malloc failed. **\n");
1736                                 return -1;
1737                         }
1738                         ext4fs_indir1_size = blksz;
1739                         ext4fs_indir1_blkno = -1;
1740                 }
1741                 if (blksz != ext4fs_indir1_size) {
1742                         free(ext4fs_indir1_block);
1743                         ext4fs_indir1_block = NULL;
1744                         ext4fs_indir1_size = 0;
1745                         ext4fs_indir1_blkno = -1;
1746                         ext4fs_indir1_block = zalloc(blksz);
1747                         if (ext4fs_indir1_block == NULL) {
1748                                 printf("** DI ext2fs read block (indir 2 1)"
1749                                         "malloc failed. **\n");
1750                                 return -1;
1751                         }
1752                         ext4fs_indir1_size = blksz;
1753                 }
1754                 if ((le32_to_cpu(inode->b.blocks.double_indir_block) <<
1755                      log2_blksz) != ext4fs_indir1_blkno) {
1756                         status =
1757                             ext4fs_devread((lbaint_t)le32_to_cpu
1758                                            (inode->b.blocks.
1759                                             double_indir_block) << log2_blksz,
1760                                            0, blksz,
1761                                            (char *)ext4fs_indir1_block);
1762                         if (status == 0) {
1763                                 printf("** DI ext2fs read block (indir 2 1)"
1764                                         "failed. **\n");
1765                                 return -1;
1766                         }
1767                         ext4fs_indir1_blkno =
1768                             le32_to_cpu(inode->b.blocks.double_indir_block) <<
1769                             log2_blksz;
1770                 }
1771
1772                 if (ext4fs_indir2_block == NULL) {
1773                         ext4fs_indir2_block = zalloc(blksz);
1774                         if (ext4fs_indir2_block == NULL) {
1775                                 printf("** DI ext2fs read block (indir 2 2)"
1776                                         "malloc failed. **\n");
1777                                 return -1;
1778                         }
1779                         ext4fs_indir2_size = blksz;
1780                         ext4fs_indir2_blkno = -1;
1781                 }
1782                 if (blksz != ext4fs_indir2_size) {
1783                         free(ext4fs_indir2_block);
1784                         ext4fs_indir2_block = NULL;
1785                         ext4fs_indir2_size = 0;
1786                         ext4fs_indir2_blkno = -1;
1787                         ext4fs_indir2_block = zalloc(blksz);
1788                         if (ext4fs_indir2_block == NULL) {
1789                                 printf("** DI ext2fs read block (indir 2 2)"
1790                                         "malloc failed. **\n");
1791                                 return -1;
1792                         }
1793                         ext4fs_indir2_size = blksz;
1794                 }
1795                 if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
1796                      log2_blksz) != ext4fs_indir2_blkno) {
1797                         status = ext4fs_devread((lbaint_t)le32_to_cpu
1798                                                 (ext4fs_indir1_block
1799                                                  [rblock /
1800                                                   perblock]) << log2_blksz, 0,
1801                                                 blksz,
1802                                                 (char *)ext4fs_indir2_block);
1803                         if (status == 0) {
1804                                 printf("** DI ext2fs read block (indir 2 2)"
1805                                         "failed. **\n");
1806                                 return -1;
1807                         }
1808                         ext4fs_indir2_blkno =
1809                             le32_to_cpu(ext4fs_indir1_block[rblock
1810                                                               /
1811                                                               perblock]) <<
1812                             log2_blksz;
1813                 }
1814                 blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
1815         }
1816         /* Tripple indirect. */
1817         else {
1818                 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
1819                                       (blksz / 4 * blksz / 4));
1820                 perblock_child = blksz / 4;
1821                 perblock_parent = ((blksz / 4) * (blksz / 4));
1822
1823                 if (ext4fs_indir1_block == NULL) {
1824                         ext4fs_indir1_block = zalloc(blksz);
1825                         if (ext4fs_indir1_block == NULL) {
1826                                 printf("** TI ext2fs read block (indir 2 1)"
1827                                         "malloc failed. **\n");
1828                                 return -1;
1829                         }
1830                         ext4fs_indir1_size = blksz;
1831                         ext4fs_indir1_blkno = -1;
1832                 }
1833                 if (blksz != ext4fs_indir1_size) {
1834                         free(ext4fs_indir1_block);
1835                         ext4fs_indir1_block = NULL;
1836                         ext4fs_indir1_size = 0;
1837                         ext4fs_indir1_blkno = -1;
1838                         ext4fs_indir1_block = zalloc(blksz);
1839                         if (ext4fs_indir1_block == NULL) {
1840                                 printf("** TI ext2fs read block (indir 2 1)"
1841                                         "malloc failed. **\n");
1842                                 return -1;
1843                         }
1844                         ext4fs_indir1_size = blksz;
1845                 }
1846                 if ((le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1847                      log2_blksz) != ext4fs_indir1_blkno) {
1848                         status = ext4fs_devread
1849                             ((lbaint_t)
1850                              le32_to_cpu(inode->b.blocks.triple_indir_block)
1851                              << log2_blksz, 0, blksz,
1852                              (char *)ext4fs_indir1_block);
1853                         if (status == 0) {
1854                                 printf("** TI ext2fs read block (indir 2 1)"
1855                                         "failed. **\n");
1856                                 return -1;
1857                         }
1858                         ext4fs_indir1_blkno =
1859                             le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1860                             log2_blksz;
1861                 }
1862
1863                 if (ext4fs_indir2_block == NULL) {
1864                         ext4fs_indir2_block = zalloc(blksz);
1865                         if (ext4fs_indir2_block == NULL) {
1866                                 printf("** TI ext2fs read block (indir 2 2)"
1867                                         "malloc failed. **\n");
1868                                 return -1;
1869                         }
1870                         ext4fs_indir2_size = blksz;
1871                         ext4fs_indir2_blkno = -1;
1872                 }
1873                 if (blksz != ext4fs_indir2_size) {
1874                         free(ext4fs_indir2_block);
1875                         ext4fs_indir2_block = NULL;
1876                         ext4fs_indir2_size = 0;
1877                         ext4fs_indir2_blkno = -1;
1878                         ext4fs_indir2_block = zalloc(blksz);
1879                         if (ext4fs_indir2_block == NULL) {
1880                                 printf("** TI ext2fs read block (indir 2 2)"
1881                                         "malloc failed. **\n");
1882                                 return -1;
1883                         }
1884                         ext4fs_indir2_size = blksz;
1885                 }
1886                 if ((le32_to_cpu(ext4fs_indir1_block[rblock /
1887                                                        perblock_parent]) <<
1888                      log2_blksz)
1889                     != ext4fs_indir2_blkno) {
1890                         status = ext4fs_devread((lbaint_t)le32_to_cpu
1891                                                 (ext4fs_indir1_block
1892                                                  [rblock /
1893                                                   perblock_parent]) <<
1894                                                 log2_blksz, 0, blksz,
1895                                                 (char *)ext4fs_indir2_block);
1896                         if (status == 0) {
1897                                 printf("** TI ext2fs read block (indir 2 2)"
1898                                         "failed. **\n");
1899                                 return -1;
1900                         }
1901                         ext4fs_indir2_blkno =
1902                             le32_to_cpu(ext4fs_indir1_block[rblock /
1903                                                               perblock_parent])
1904                             << log2_blksz;
1905                 }
1906
1907                 if (ext4fs_indir3_block == NULL) {
1908                         ext4fs_indir3_block = zalloc(blksz);
1909                         if (ext4fs_indir3_block == NULL) {
1910                                 printf("** TI ext2fs read block (indir 2 2)"
1911                                         "malloc failed. **\n");
1912                                 return -1;
1913                         }
1914                         ext4fs_indir3_size = blksz;
1915                         ext4fs_indir3_blkno = -1;
1916                 }
1917                 if (blksz != ext4fs_indir3_size) {
1918                         free(ext4fs_indir3_block);
1919                         ext4fs_indir3_block = NULL;
1920                         ext4fs_indir3_size = 0;
1921                         ext4fs_indir3_blkno = -1;
1922                         ext4fs_indir3_block = zalloc(blksz);
1923                         if (ext4fs_indir3_block == NULL) {
1924                                 printf("** TI ext2fs read block (indir 2 2)"
1925                                         "malloc failed. **\n");
1926                                 return -1;
1927                         }
1928                         ext4fs_indir3_size = blksz;
1929                 }
1930                 if ((le32_to_cpu(ext4fs_indir2_block[rblock
1931                                                        /
1932                                                        perblock_child]) <<
1933                      log2_blksz) != ext4fs_indir3_blkno) {
1934                         status =
1935                             ext4fs_devread((lbaint_t)le32_to_cpu
1936                                            (ext4fs_indir2_block
1937                                             [(rblock / perblock_child)
1938                                              % (blksz / 4)]) << log2_blksz, 0,
1939                                            blksz, (char *)ext4fs_indir3_block);
1940                         if (status == 0) {
1941                                 printf("** TI ext2fs read block (indir 2 2)"
1942                                        "failed. **\n");
1943                                 return -1;
1944                         }
1945                         ext4fs_indir3_blkno =
1946                             le32_to_cpu(ext4fs_indir2_block[(rblock /
1947                                                                perblock_child) %
1948                                                               (blksz /
1949                                                                4)]) <<
1950                             log2_blksz;
1951                 }
1952
1953                 blknr = le32_to_cpu(ext4fs_indir3_block
1954                                       [rblock % perblock_child]);
1955         }
1956         debug("read_allocated_block %ld\n", blknr);
1957
1958         return blknr;
1959 }
1960
1961 /**
1962  * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's
1963  *                          global pointers
1964  *
1965  * This function assures that for a file with the same name but different size
1966  * the sequential store on the ext4 filesystem will be correct.
1967  *
1968  * In this function the global data, responsible for internal representation
1969  * of the ext4 data are initialized to the reset state. Without this, during
1970  * replacement of the smaller file with the bigger truncation of new file was
1971  * performed.
1972  */
1973 void ext4fs_reinit_global(void)
1974 {
1975         if (ext4fs_indir1_block != NULL) {
1976                 free(ext4fs_indir1_block);
1977                 ext4fs_indir1_block = NULL;
1978                 ext4fs_indir1_size = 0;
1979                 ext4fs_indir1_blkno = -1;
1980         }
1981         if (ext4fs_indir2_block != NULL) {
1982                 free(ext4fs_indir2_block);
1983                 ext4fs_indir2_block = NULL;
1984                 ext4fs_indir2_size = 0;
1985                 ext4fs_indir2_blkno = -1;
1986         }
1987         if (ext4fs_indir3_block != NULL) {
1988                 free(ext4fs_indir3_block);
1989                 ext4fs_indir3_block = NULL;
1990                 ext4fs_indir3_size = 0;
1991                 ext4fs_indir3_blkno = -1;
1992         }
1993 }
1994 void ext4fs_close(void)
1995 {
1996         if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
1997                 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
1998                 ext4fs_file = NULL;
1999         }
2000         if (ext4fs_root != NULL) {
2001                 free(ext4fs_root);
2002                 ext4fs_root = NULL;
2003         }
2004
2005         ext4fs_reinit_global();
2006 }
2007
2008 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
2009                                 struct ext2fs_node **fnode, int *ftype)
2010 {
2011         unsigned int fpos = 0;
2012         int status;
2013         loff_t actread;
2014         struct ext2fs_node *diro = (struct ext2fs_node *) dir;
2015
2016 #ifdef DEBUG
2017         if (name != NULL)
2018                 printf("Iterate dir %s\n", name);
2019 #endif /* of DEBUG */
2020         if (!diro->inode_read) {
2021                 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2022                 if (status == 0)
2023                         return 0;
2024         }
2025         /* Search the file.  */
2026         while (fpos < le32_to_cpu(diro->inode.size)) {
2027                 struct ext2_dirent dirent;
2028
2029                 status = ext4fs_read_file(diro, fpos,
2030                                            sizeof(struct ext2_dirent),
2031                                            (char *)&dirent, &actread);
2032                 if (status < 0)
2033                         return 0;
2034
2035                 if (dirent.direntlen == 0) {
2036                         printf("Failed to iterate over directory %s\n", name);
2037                         return 0;
2038                 }
2039
2040                 if (dirent.namelen != 0) {
2041                         char filename[dirent.namelen + 1];
2042                         struct ext2fs_node *fdiro;
2043                         int type = FILETYPE_UNKNOWN;
2044
2045                         status = ext4fs_read_file(diro,
2046                                                   fpos +
2047                                                   sizeof(struct ext2_dirent),
2048                                                   dirent.namelen, filename,
2049                                                   &actread);
2050                         if (status < 0)
2051                                 return 0;
2052
2053                         fdiro = zalloc(sizeof(struct ext2fs_node));
2054                         if (!fdiro)
2055                                 return 0;
2056
2057                         fdiro->data = diro->data;
2058                         fdiro->ino = le32_to_cpu(dirent.inode);
2059
2060                         filename[dirent.namelen] = '\0';
2061
2062                         if (dirent.filetype != FILETYPE_UNKNOWN) {
2063                                 fdiro->inode_read = 0;
2064
2065                                 if (dirent.filetype == FILETYPE_DIRECTORY)
2066                                         type = FILETYPE_DIRECTORY;
2067                                 else if (dirent.filetype == FILETYPE_SYMLINK)
2068                                         type = FILETYPE_SYMLINK;
2069                                 else if (dirent.filetype == FILETYPE_REG)
2070                                         type = FILETYPE_REG;
2071                         } else {
2072                                 status = ext4fs_read_inode(diro->data,
2073                                                            le32_to_cpu
2074                                                            (dirent.inode),
2075                                                            &fdiro->inode);
2076                                 if (status == 0) {
2077                                         free(fdiro);
2078                                         return 0;
2079                                 }
2080                                 fdiro->inode_read = 1;
2081
2082                                 if ((le16_to_cpu(fdiro->inode.mode) &
2083                                      FILETYPE_INO_MASK) ==
2084                                     FILETYPE_INO_DIRECTORY) {
2085                                         type = FILETYPE_DIRECTORY;
2086                                 } else if ((le16_to_cpu(fdiro->inode.mode)
2087                                             & FILETYPE_INO_MASK) ==
2088                                            FILETYPE_INO_SYMLINK) {
2089                                         type = FILETYPE_SYMLINK;
2090                                 } else if ((le16_to_cpu(fdiro->inode.mode)
2091                                             & FILETYPE_INO_MASK) ==
2092                                            FILETYPE_INO_REG) {
2093                                         type = FILETYPE_REG;
2094                                 }
2095                         }
2096 #ifdef DEBUG
2097                         printf("iterate >%s<\n", filename);
2098 #endif /* of DEBUG */
2099                         if ((name != NULL) && (fnode != NULL)
2100                             && (ftype != NULL)) {
2101                                 if (strcmp(filename, name) == 0) {
2102                                         *ftype = type;
2103                                         *fnode = fdiro;
2104                                         return 1;
2105                                 }
2106                         } else {
2107                                 if (fdiro->inode_read == 0) {
2108                                         status = ext4fs_read_inode(diro->data,
2109                                                                  le32_to_cpu(
2110                                                                  dirent.inode),
2111                                                                  &fdiro->inode);
2112                                         if (status == 0) {
2113                                                 free(fdiro);
2114                                                 return 0;
2115                                         }
2116                                         fdiro->inode_read = 1;
2117                                 }
2118                                 switch (type) {
2119                                 case FILETYPE_DIRECTORY:
2120                                         printf("<DIR> ");
2121                                         break;
2122                                 case FILETYPE_SYMLINK:
2123                                         printf("<SYM> ");
2124                                         break;
2125                                 case FILETYPE_REG:
2126                                         printf("      ");
2127                                         break;
2128                                 default:
2129                                         printf("< ? > ");
2130                                         break;
2131                                 }
2132                                 printf("%10u %s\n",
2133                                        le32_to_cpu(fdiro->inode.size),
2134                                         filename);
2135                         }
2136                         free(fdiro);
2137                 }
2138                 fpos += le16_to_cpu(dirent.direntlen);
2139         }
2140         return 0;
2141 }
2142
2143 static char *ext4fs_read_symlink(struct ext2fs_node *node)
2144 {
2145         char *symlink;
2146         struct ext2fs_node *diro = node;
2147         int status;
2148         loff_t actread;
2149
2150         if (!diro->inode_read) {
2151                 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2152                 if (status == 0)
2153                         return NULL;
2154         }
2155         symlink = zalloc(le32_to_cpu(diro->inode.size) + 1);
2156         if (!symlink)
2157                 return NULL;
2158
2159         if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) {
2160                 strncpy(symlink, diro->inode.b.symlink,
2161                          le32_to_cpu(diro->inode.size));
2162         } else {
2163                 status = ext4fs_read_file(diro, 0,
2164                                            le32_to_cpu(diro->inode.size),
2165                                            symlink, &actread);
2166                 if ((status < 0) || (actread == 0)) {
2167                         free(symlink);
2168                         return NULL;
2169                 }
2170         }
2171         symlink[le32_to_cpu(diro->inode.size)] = '\0';
2172         return symlink;
2173 }
2174
2175 static int ext4fs_find_file1(const char *currpath,
2176                              struct ext2fs_node *currroot,
2177                              struct ext2fs_node **currfound, int *foundtype)
2178 {
2179         char fpath[strlen(currpath) + 1];
2180         char *name = fpath;
2181         char *next;
2182         int status;
2183         int type = FILETYPE_DIRECTORY;
2184         struct ext2fs_node *currnode = currroot;
2185         struct ext2fs_node *oldnode = currroot;
2186
2187         strncpy(fpath, currpath, strlen(currpath) + 1);
2188
2189         /* Remove all leading slashes. */
2190         while (*name == '/')
2191                 name++;
2192
2193         if (!*name) {
2194                 *currfound = currnode;
2195                 return 1;
2196         }
2197
2198         for (;;) {
2199                 int found;
2200
2201                 /* Extract the actual part from the pathname. */
2202                 next = strchr(name, '/');
2203                 if (next) {
2204                         /* Remove all leading slashes. */
2205                         while (*next == '/')
2206                                 *(next++) = '\0';
2207                 }
2208
2209                 if (type != FILETYPE_DIRECTORY) {
2210                         ext4fs_free_node(currnode, currroot);
2211                         return 0;
2212                 }
2213
2214                 oldnode = currnode;
2215
2216                 /* Iterate over the directory. */
2217                 found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
2218                 if (found == 0)
2219                         return 0;
2220
2221                 if (found == -1)
2222                         break;
2223
2224                 /* Read in the symlink and follow it. */
2225                 if (type == FILETYPE_SYMLINK) {
2226                         char *symlink;
2227
2228                         /* Test if the symlink does not loop. */
2229                         if (++symlinknest == 8) {
2230                                 ext4fs_free_node(currnode, currroot);
2231                                 ext4fs_free_node(oldnode, currroot);
2232                                 return 0;
2233                         }
2234
2235                         symlink = ext4fs_read_symlink(currnode);
2236                         ext4fs_free_node(currnode, currroot);
2237
2238                         if (!symlink) {
2239                                 ext4fs_free_node(oldnode, currroot);
2240                                 return 0;
2241                         }
2242
2243                         debug("Got symlink >%s<\n", symlink);
2244
2245                         if (symlink[0] == '/') {
2246                                 ext4fs_free_node(oldnode, currroot);
2247                                 oldnode = &ext4fs_root->diropen;
2248                         }
2249
2250                         /* Lookup the node the symlink points to. */
2251                         status = ext4fs_find_file1(symlink, oldnode,
2252                                                     &currnode, &type);
2253
2254                         free(symlink);
2255
2256                         if (status == 0) {
2257                                 ext4fs_free_node(oldnode, currroot);
2258                                 return 0;
2259                         }
2260                 }
2261
2262                 ext4fs_free_node(oldnode, currroot);
2263
2264                 /* Found the node! */
2265                 if (!next || *next == '\0') {
2266                         *currfound = currnode;
2267                         *foundtype = type;
2268                         return 1;
2269                 }
2270                 name = next;
2271         }
2272         return -1;
2273 }
2274
2275 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
2276         struct ext2fs_node **foundnode, int expecttype)
2277 {
2278         int status;
2279         int foundtype = FILETYPE_DIRECTORY;
2280
2281         symlinknest = 0;
2282         if (!path)
2283                 return 0;
2284
2285         status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
2286         if (status == 0)
2287                 return 0;
2288
2289         /* Check if the node that was found was of the expected type. */
2290         if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
2291                 return 0;
2292         else if ((expecttype == FILETYPE_DIRECTORY)
2293                    && (foundtype != expecttype))
2294                 return 0;
2295
2296         return 1;
2297 }
2298
2299 int ext4fs_open(const char *filename, loff_t *len)
2300 {
2301         struct ext2fs_node *fdiro = NULL;
2302         int status;
2303
2304         if (ext4fs_root == NULL)
2305                 return -1;
2306
2307         ext4fs_file = NULL;
2308         status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
2309                                   FILETYPE_REG);
2310         if (status == 0)
2311                 goto fail;
2312
2313         if (!fdiro->inode_read) {
2314                 status = ext4fs_read_inode(fdiro->data, fdiro->ino,
2315                                 &fdiro->inode);
2316                 if (status == 0)
2317                         goto fail;
2318         }
2319         *len = le32_to_cpu(fdiro->inode.size);
2320         ext4fs_file = fdiro;
2321
2322         return 0;
2323 fail:
2324         ext4fs_free_node(fdiro, &ext4fs_root->diropen);
2325
2326         return -1;
2327 }
2328
2329 int ext4fs_mount(unsigned part_length)
2330 {
2331         struct ext2_data *data;
2332         int status;
2333         struct ext_filesystem *fs = get_fs();
2334         data = zalloc(SUPERBLOCK_SIZE);
2335         if (!data)
2336                 return 0;
2337
2338         /* Read the superblock. */
2339         status = ext4_read_superblock((char *)&data->sblock);
2340
2341         if (status == 0)
2342                 goto fail;
2343
2344         /* Make sure this is an ext2 filesystem. */
2345         if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
2346                 goto fail_noerr;
2347
2348
2349         if (le32_to_cpu(data->sblock.revision_level) == 0) {
2350                 fs->inodesz = 128;
2351                 fs->gdsize = 32;
2352         } else {
2353                 debug("EXT4 features COMPAT: %08x INCOMPAT: %08x RO_COMPAT: %08x\n",
2354                       __le32_to_cpu(data->sblock.feature_compatibility),
2355                       __le32_to_cpu(data->sblock.feature_incompat),
2356                       __le32_to_cpu(data->sblock.feature_ro_compat));
2357
2358                 fs->inodesz = le16_to_cpu(data->sblock.inode_size);
2359                 fs->gdsize = le32_to_cpu(data->sblock.feature_incompat) &
2360                         EXT4_FEATURE_INCOMPAT_64BIT ?
2361                         le16_to_cpu(data->sblock.descriptor_size) : 32;
2362         }
2363
2364         debug("EXT2 rev %d, inode_size %d, descriptor size %d\n",
2365               le32_to_cpu(data->sblock.revision_level),
2366               fs->inodesz, fs->gdsize);
2367
2368         data->diropen.data = data;
2369         data->diropen.ino = 2;
2370         data->diropen.inode_read = 1;
2371         data->inode = &data->diropen.inode;
2372
2373         status = ext4fs_read_inode(data, 2, data->inode);
2374         if (status == 0)
2375                 goto fail;
2376
2377         ext4fs_root = data;
2378
2379         return 1;
2380 fail:
2381         printf("Failed to mount ext2 filesystem...\n");
2382 fail_noerr:
2383         free(data);
2384         ext4fs_root = NULL;
2385
2386         return 0;
2387 }